Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 64)

1-52
IM 04L31A01-01E
Repeat Function
This function repeats the operation over a section of the program pattern consisting of
continuous segments. To perform repeat operation, you specify the repeat start
segment, repeat end segment, and the number of repetitions (repeat count).
Below is a program pattern in which the repeat count = 1, repeat start segment number = 3, and
repeat end segment number = 5. You can also specify an infinite number of repetitions.
TSP1
TSP2
SEG4 SEG6 SEG5 SEG3 SEG5 SEG4 SEG3 SEG2 SEG1
Repeat period: repeat count = 1
Repeat start
segment number = 3
Repeat end
segment number = 5
TSPn: Final target setpoint
Program pattern for
the 2nd loop
Program pattern for
the 1st loop
Same value
Note
• The operation when repeat action, repeat start segment, repeat end segment, and repeat
frequency (including infinity) are changed during program control is indicated below.
• When changed to repeat OFF or when the segment number at that point is larger than
the repeat end segment
Repeat action is not performed regardless of the repeat action performed (or not
performed) up to that point.
• When the segment number at that point is smaller than the repeat start segment
Repeat action is performed from the first repetition using the new settings regardless of
the repeat action performed (or not performed) up to that point.
• When the segment number at that point is between the repeat start segment and
repeat end segment
If the change is made before the repeat action is performed (including a change from
repeat OFF) or after the repeat action has been finished, repeat action is performed from
the first repetition using the new settings. If the change is made during repeat action, the
repeat action is performed the number of times specified by the new repeat frequency
including the number of repetitions that have been performed before the change. If the
new repeat frequency is smaller than or equal to the number of repetitions that have
been performed already before the change, the repeat action is terminated after the
current repetition. However, if the repeat frequency is changed from infinity to a finite
value, repeat action is started using the new repeat frequency from the change point.
• Only a single period of repeat action can be specified for each program pattern.
• Set the first SP of the repeat start segment the same as the last SP of the repeat end
segment. If they do not match, the start segment pattern will be affected.
• In repeat action, all time events that are ON are turned OFF when returning from repeat end
segment to repeat start segment. If “time-prioritized PV start” or “ramp-prioritized PV start” is
specified as a starting condition of the program operation, PV start is also performed when repeat
operation is started. However, PV start does not apply to loops in local mode or loops that are
stopped. In cascade control, PV start does not apply if the primary loop is in local mode or the
secondary loop is stopped. If PV start cannot be carried out, “starting target setpoint start” is
carried out.
1.11 Program Control Related Settings